Dynamic DNS Timeout on my MAX ON THE GO... Help!

Dearest All, I have two MOTG fully meshed throught LTE since I do have public IP addresses on my SIMs. This PepVPN Always worked good.

On those MOTG, I’m using no-ip as DDNS provider and it was correctly working.

Now are two days that I got errors like:

DDNS: Domain xxxxxxxx.ddns.net connection timeout for WAN 2.
DDNS: Domain xxxxxxxx.ddns.net connection timeout for WAN 1.

On both routers.

Does anybody had similar issues? Already checked on no-ip.org that my account is working.

Thank you very much in advance.